TeXStudio copy and paste loses tabulations i.e. layout

When I make the copy of a block of source code in TeXStudio, I lose the tabulation i.e. the layout. Boring! Example:

Before copy:

                    $\begin{vmatrix}                        3-\lambda & 1 & -1\\                        -2 & -\lambda & 2\\                        0 & 0 & 1-\lambda                    \end{vmatrix}$

After paste:

                    $\begin{vmatrix}                        3-\lambda & 1 & -1\\                        -2 & -\lambda & 2\\                        0 & 0 & 1-\lambda                    \end{vmatrix}$                    \begin{vmatrix}    3-\lambda & 1 & -1\\    -2 & -\lambda & 2\\    0 & 0 & 1-\lambda\end{vmatrix}

What I expect:

                    $\begin{vmatrix}                        3-\lambda & 1 & -1\\                        -2 & -\lambda & 2\\                        0 & 0 & 1-\lambda                    \end{vmatrix}$                    $\begin{vmatrix}                        3-\lambda & 1 & -1\\                        -2 & -\lambda & 2\\                        0 & 0 & 1-\lambda                    \end{vmatrix}$

When I move the insertion point prior paste, I have the same shifts within the copied part.

Bug? Any bypass?